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    <title>ShellCheck: SC3043 – In POSIX sh, `local` is undefined.</title>
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    <h1>SC3043 – ShellCheck Wiki</h1>
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    <h2 id="in-posix-sh-local-is-undefined">In POSIX sh, <code>local</code>
is undefined.</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC3043.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">myfunc()</span> <span class="kw">{</span></span>
<span id="cb1-2"><a href="SC3043.html#cb1-2" aria-hidden="true" tabindex="-1"></a>  <span class="bu">local</span> <span class="va">i</span><span class="op">=</span>0</span>
<span id="cb1-3"><a href="SC3043.html#cb1-3" aria-hidden="true" tabindex="-1"></a>  <span class="ex">..</span></span>
<span id="cb1-4"><a href="SC3043.html#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="kw">}</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<p>In POSIX sh, you can adopt some convention to avoid accidentally
overwriting variables names, e.g. prefixing with the function name:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC3043.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="fu">myfunc()</span> <span class="kw">{</span></span>
<span id="cb2-2"><a href="SC3043.html#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="va">_myfunc_i</span><span class="op">=</span>0</span>
<span id="cb2-3"><a href="SC3043.html#cb2-3" aria-hidden="true" tabindex="-1"></a>  <span class="ex">..</span></span>
<span id="cb2-4"><a href="SC3043.html#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="kw">}</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p><code>local</code> is supported in many shells, including bash, ksh,
dash, and BusyBox ash. However, strictly speaking, it's not POSIX.</p>
<h3 id="exceptions">Exceptions:</h3>
<p>Since quite a lot of real world shells support this feature, you may
decide to <a href="ignore.html">ignore</a> the warning.</p>
<h3 id="related-resources">Related resources:</h3>
<ul>
<li>Help by adding links to BashFAQ, StackOverflow, man pages, POSIX,
etc!</li>
</ul>
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